3.4.0

This is a fairly small release that brings a few new bounding box related functions, all suggested by @MartinSStewart in #129 and #130:

BoundingBox2d.withDimensions : 
    ( Quantity Float units, Quantity Float units )
    -> Point2d units coordinates 
    -> BoundingBox2d units coordinates

BoundingBox3d.withDimensions : 
    ( Quantity Float units, Quantity Float units, Quantity Float units )
    -> Point3d units coordinates 
    -> BoundingBox3d units coordinates

Rectangle2d.fromBoundingBox :
    BoundingBox2d units coordinates
    -> Rectangle2d units coordinates

Block3d.fromBoundingBox :
    BoundingBox3d units coordinates
    -> Block3d units coordinates